(A) Abscisic Acid $(ABA)$ is a plant growth inhibitor. Its primary physiological role is to induce stomatal closure in response to water stress,thereb

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(A) Abscisic Acid $(ABA)$ is a plant growth inhibitor. Its primary physiological role is to induce stomatal closure in response to water stress,thereby reducing transpiration and conserving water. It also promotes seed dormancy and abscission of leaves and fruits.